By Charles Darwin
Darwin had lengthy been fascinated with insectivorous crops, from the local British sundews and bladderworts to the unique pinguiculas and nepenthes which he encountered throughout the Beagle voyage. turning out to be in environments low in soil meals, their hugely specialized methods of acquiring adequate nutrition, together with the aptitude for quick flow with regards to the Venus flytrap, have been proof of evolutionary variation. yet he used to be additionally drawn to what meals they wanted, and whether or not they will be selective whilst provided a diversified nutrition; and the way did the flytrap shut its seize on its prey? Darwin carried out more than a few basic yet creative experiments on his selection of insectivores and saw and famous the result of every one along with his well-known meticulousness. the implications may be noticeable during this ebook, which continues to be of large curiosity to someone whose mind's eye has been fired through those unusual and gorgeous vegetation.
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Example text
III. THE PEOOESS OF AGGREGATION. 47 stream of protoplasm on the walls of the cells ceases to be visible; I observed this fact repeatedly, but will give only one instance. A pale purple leaf was placed in a few drops of a solution of one part to '292 of water, and in 2 hrs. , during which time many more spheres were formed, the stream was no longer distinguishable on the most careful examination; and this no doubt was due to the contained granules having become united with the spheres, so that nothing was left by which the movement of the limpid protoplasm could be perceived.
Every single tentacle had carried its little load to the centre; but the unusually large size of the particles will account for this result. In another case -f of the particles of cinder, glass, and thread, placed on separate glands, were carried towards, or actually to, the centre; in another case 1, in another -^r, and in the last case only -^ were thus carried inwards, the small proportion being here due, at least in part, to the leaves being rather old and inactive. Occasionally a gland, with its light load, could be seen through a strong lens to move an extremely short distance and then stop; this was especially apt to occur when excessively minute particles, much less than those of which the measurements will be immediately given, were placed on glands; so that we here have nearly the limit of any action.
The process of redissolution travels upwards from the bases of the tentacles to the glands, and therefore in a reversed direction to that of aggre^ gation. Tentacles in an aggregated condition were shown to Prof. Huxley, Dr. Hooker, and Dr. Burdon Sanderson, who observed the changes under the microscope, and were much struck with the whole phenomenon. DEOSERA KOTUNDIFOLIA. CHAP. III. The little masses of aggregated matter are of the most diversified shapes, often spherical or oval, sometimes much elongated, or quite irregular with threador necklace-like or club-formed projections.